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4x+2a=3x+1 4x-3x+2a=1 x+2a=1 x=1-2a(橫著看)3x+2a=6x+1 3x-6x+2a=1 -3x+2a=1 -3x=1-2a 2a=3x+1當x=1-2a時2a=3-6a+1 8a=4 a=1/2(橫著看)
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